[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.365866][ T26] audit: type=1800 audit(1566870099.227:25): pid=8530 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.398384][ T26] audit: type=1800 audit(1566870099.227:26): pid=8530 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.448835][ T26] audit: type=1800 audit(1566870099.227:27): pid=8530 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.227' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 68.577267][ T8887] ------------[ cut here ]------------ [ 68.582854][ T8887] WARNING: CPU: 0 PID: 8887 at kernel/time/posix-cpu-timers.c:401 posix_cpu_timer_del+0x2f0/0x3b0 [ 68.593406][ T8887] Kernel panic - not syncing: panic_on_warn set ... [ 68.599969][ T8887] CPU: 0 PID: 8887 Comm: syz-executor029 Not tainted 5.3.0-rc6-next-20190826 #73 [ 68.609043][ T8887] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.619069][ T8887] Call Trace: [ 68.622336][ T8887] dump_stack+0x172/0x1f0 [ 68.626667][ T8887] ? posix_cpu_timer_del+0x230/0x3b0 [ 68.631923][ T8887] panic+0x2dc/0x755 [ 68.635789][ T8887] ? add_taint.cold+0x16/0x16 [ 68.640443][ T8887] ? printk+0xba/0xed [ 68.644402][ T8887] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 68.649835][ T8887] ? __warn.cold+0x14/0x3c [ 68.654223][ T8887] ? __warn+0xd9/0x1d0 [ 68.658268][ T8887] ? posix_cpu_timer_del+0x2f0/0x3b0 [ 68.663524][ T8887] __warn.cold+0x2f/0x3c [ 68.667738][ T8887] ? report_bug.cold+0x63/0xad [ 68.672481][ T8887] ? posix_cpu_timer_del+0x2f0/0x3b0 [ 68.677739][ T8887] report_bug+0x289/0x300 [ 68.682043][ T8887] do_error_trap+0x11b/0x200 [ 68.686605][ T8887] do_invalid_op+0x37/0x50 [ 68.690996][ T8887] ? posix_cpu_timer_del+0x2f0/0x3b0 [ 68.696252][ T8887] invalid_op+0x23/0x30 [ 68.700400][ T8887] RIP: 0010:posix_cpu_timer_del+0x2f0/0x3b0 [ 68.706264][ T8887] Code: 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 83 bb c8 00 00 00 00 74 16 e8 10 58 0d 00 <0f> 0b e9 87 fe ff ff e8 44 41 48 00 e9 dd fd ff ff e8 fa 57 0d 00 [ 68.725839][ T8887] RSP: 0018:ffff888093297a30 EFLAGS: 00010093 [ 68.731875][ T8887] RAX: ffff8880939a20c0 RBX: ffff8880a8968450 RCX: 1ffff1101273452a [ 68.739843][ T8887] RDX: 0000000000000000 RSI: ffffffff8164d5c0 RDI: ffff8880a8968518 [ 68.747786][ T8887] RBP: ffff888093297ac0 R08: 0000000000000002 R09: ffff8880939a2958 [ 68.755731][ T8887] R10: fffffbfff138b0f8 R11: ffffffff89c587c7 R12: ffff88809157a100 [ 68.763690][ T8887] R13: 1ffff11012652f47 R14: ffff888093297a98 R15: ffff8880a89684a8 [ 68.771646][ T8887] ? posix_cpu_timer_del+0x2f0/0x3b0 [ 68.776908][ T8887] ? lock_acquire+0x190/0x410 [ 68.781556][ T8887] ? thread_cpu_clock_getres+0x90/0x90 [ 68.786990][ T8887] ? thread_cpu_clock_getres+0x90/0x90 [ 68.792417][ T8887] exit_itimers+0xdb/0x2e0 [ 68.796809][ T8887] do_exit+0x1980/0x2e60 [ 68.801042][ T8887] ? do_raw_spin_lock+0x12a/0x2e0 [ 68.806040][ T8887] ? get_signal+0xafb/0x2500 [ 68.810607][ T8887] ? mm_update_next_owner+0x640/0x640 [ 68.815971][ T8887] do_group_exit+0x135/0x360 [ 68.820538][ T8887] get_signal+0x47c/0x2500 [ 68.824931][ T8887] ? __x64_sys_futex+0x4c2/0x590 [ 68.829849][ T8887] do_signal+0x87/0x1700 [ 68.834063][ T8887] ? trace_hardirqs_on+0x67/0x240 [ 68.839058][ T8887] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 68.844746][ T8887] ? setup_sigcontext+0x7d0/0x7d0 [ 68.849749][ T8887] ? do_syscall_64+0x65f/0x760 [ 68.854483][ T8887] ? exit_to_usermode_loop+0x43/0x380 [ 68.859827][ T8887] ? lockdep_hardirqs_on+0x418/0x5d0 [ 68.865250][ T8887] ? trace_hardirqs_on+0x67/0x240 [ 68.870252][ T8887] exit_to_usermode_loop+0x286/0x380 [ 68.875518][ T8887] do_syscall_64+0x65f/0x760 [ 68.880110][ T8887] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.885977][ T8887] RIP: 0033:0x4466b9 [ 68.889850][ T8887] Code: e8 5c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 0b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 68.909425][ T8887] RSP: 002b:00007fffbc0b8368 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 68.917804][ T8887] RAX: 0000000000000000 RBX: 0000000000010bca RCX: 00000000004466b9 [ 68.925754][ T8887] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc2c [ 68.933695][ T8887] RBP: 00000000006dbc2c R08: 000000037ffffa00 R09: 000000037ffffa00 [ 68.941638][ T8887] R10: 00007fffbc0b8380 R11: 0000000000000246 R12: 00000000006dbc20 [ 68.949580][ T8887] R13: 0000000000000000 R14: 000000000000002d R15: 20c49ba5e353f7cf [ 68.958706][ T8887] Kernel Offset: disabled [ 68.963079][ T8887] Rebooting in 86400 seconds..